Abstract
Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers. Analyses of total RNA, nitrogen, protein and inorganic phosphorus in shoot tips of deflowered and control (flower‐ and fruit‐bearing) plants throughout ontogeny revealed that the levels of all these metabolites declined during senescence. Also throughout ontogeny shoot tips of control and deflowered plants were compared with respect to their ability to enzymically degrade RNA and to take up and incorporate P 32 ‐orthophosphate into RNA. The specific activity of ribonuclease increased as senescence progressed while the absolute activity appeared to decrease in correlation with a decrease in total nitrogen content. Compared with nonsenescing shoot tips, senescing shoot tips accumulated less P 32 but exhibited an apparent enhancement of P 32 incorporation into RNA, which was attributed to a reduction in the endogenous phosphorus pool causing a smaller dilution of the accumulated P 32 . It is concluded that decreases in the levels of RNA, protein and inorganic phosphorus and in the tran‐spirational uptake of nutrients are factors correlated with senescence of the shoot apex.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Removing flowers delayed senescence of pea shoot apices of cultivar Alaska, measured by cessation of stem elongation.
- Taxon
- Pisum sativum
Lathyrus oleraceuse0 - Material
- Alaskae0
- Organ / stage
- shoot apicese0
- Treatment
- removal of flowerse0
- Outcome
- Senescence of shoot apicese0
- Direction
- delayede0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e1“deflowered and control”
Claim · model-written summary
Total RNA, nitrogen and protein levels in pea shoot tips declined during senescence.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- shoot tipse1
- Outcome
- total RNA, nitrogen, proteine1
- Direction
- declinede2
- Qualifier
- during senescencee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e1“Analyses of total RNA, nitrogen, protein and inorganic phosphorus in shoot tips”
e2“the levels of all these metabolites declined during senescence”
Claim · model-written summary
Inorganic phosphorus levels in pea shoot tips declined during senescence.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- shoot tipse1
- Outcome
- inorganic phosphoruse1
- Direction
- declinede2
- Qualifier
- during senescencee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e1“Analyses of total RNA, nitrogen, protein and inorganic phosphorus in shoot tips”
e2“the levels of all these metabolites declined during senescence”
Claim · model-written summary
The specific activity of ribonuclease increased as pea shoot apices senesced.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Gene
- ribonucleasee2
- Outcome
- specific activitye2
- Direction
- increasede2
- Qualifier
- as senescence progressede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e2“The specific activity of ribonuclease increased as senescence progressed”
Claim · model-written summary
The absolute activity of ribonuclease appeared to decrease in correlation with a decrease in total nitrogen content.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Compound
- total nitrogen contente3
- Outcome
- absolute activitye3
- Direction
- decreasee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e3“the absolute activity appeared to decrease in correlation with a decrease in total nitrogen content”
Claim · model-written summary
Senescing pea shoot tips accumulated less P 32 than nonsenescing shoot tips.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- senescing shoot tipse4
- Outcome
- P 32e4
- Direction
- lesse4
- Comparator
- nonsenescing shoot tipse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e4“Compared with nonsenescing shoot tips, senescing shoot tips accumulated less P 32”
Claim · model-written summary
Senescing pea shoot tips showed an apparent enhancement of P 32 incorporation into RNA compared with nonsenescing shoot tips.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- senescing shoot tipse4
- Outcome
- P 32 incorporation into RNAe5
- Direction
- enhancemente5
- Comparator
- nonsenescing shoot tipse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e4“Compared with nonsenescing shoot tips, senescing shoot tips accumulated less P 32”
e5“exhibited an apparent enhancement of P 32 incorporation into RNA”
Claim · model-written summary
The enhanced P 32 incorporation into RNA is attributed to a reduced endogenous phosphorus pool causing smaller dilution of the accumulated P 32.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Compound
- endogenous phosphorus poole6
- Outcome
- P 32 incorporation into RNAe5
- Qualifier
- a reduction in the endogenous phosphorus pool causing a smaller dilution of the accumulated P 32e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e5“exhibited an apparent enhancement of P 32 incorporation into RNA”
e6“which was attributed to a reduction in the endogenous phosphorus pool causing a smaller dilution of the accumulated P 32”
Claim · model-written summary
Decreases in RNA, protein and inorganic phosphorus levels are correlated with senescence of the pea shoot apex.
- Taxon
- Pisum sativumLathyrus oleraceuse0
- Organ / stage
- shoot apexe2
- Outcome
- senescence of the shoot apexe2
- Direction
- correlatede2
- Qualifier
- decreases in the levels of RNA, protein and inorganic phosphoruse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence of shoot apices of Pisum sativum L. ‘Alaska’ as measured by cessation of stem elongation was delayed by removal of flowers”
e1“It is concluded that decreases in the levels of RNA, protein and inorganic phosphorus”
e2“are factors correlated with senescence of the shoot apex”